carrier furnace issue

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Old 10-13-09, 02:39 PM
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carrier furnace issue

any help would be appreciated.carrier 8000 turn on furnace
exhaust fan starts to run;ignitor glows about 15 seconds later;solenoid on gas valve doesnt open to let fuel out.im assuming a bad circuit board or solenoid.if i check for power at solenoid after ignitor glows i should have 110v.is this correct?
if not can it be anything other than circuit board?
thanks to anyone for help
 
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Old 10-13-09, 05:58 PM
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If the inducer keeps running, that means the stat is not shutting off (a good thing). But you could mysteriously be dropping pressure. You should always check the 24 VAC current flow in and out of a pressure switch when something like this happens.

Also, are you certain by either no voltmeter activity at gas valve terminals?, nor clicking can be felt or heard at the gas valve?

We can advise further on specifics and how-to's if you are around.
 
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Old 10-13-09, 06:57 PM
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yes there is no 24 v @ the gas valve when ignitor glows
am i correct to assume this is probably a circuit board problem?
 
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Old 10-14-09, 06:09 AM
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Have you checked the pressure switch yet?
 
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Old 10-14-09, 06:26 AM
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sorry yes i have current @ pressure switch in and out
i mistakenly grounded out probe and blew fuse in circuit board
replaced it ok
 
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Old 10-14-09, 08:07 AM
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Do you mean the furnace is fixed now? Simply and only by replacing the fuse? If so, the fuse must have been blown before. Because why then were you using the test probes on the furnace in the first place if there wasn't already a pre-existing problem? It is either that or your problem is not fixed and will likely return.

Or did you mean when you said "replaced it okay", that you simply had enough knowledge to be able to find and replace the fuse - yet you still have your problem? Keep us posted.
 
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Old 10-14-09, 11:24 AM
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sorry.i blew the fuse by accident checking the prssure switch for power.now,i have power in and out of pressure switch.no power at the gas valve/solenoid after ignitor starts to glow.if i keep volt meter on the solenoid/valve while the ignitor glows on then off on then off but nothing ever at the valve/solenoid
thanks
 
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Old 10-16-09, 07:45 PM
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success

thanks to all involved in my issue. i recieved a circuit board from ebay for 75 bucks brand new. add 22 dollars for 2 day delivery. put away the space heaters daddy fixed it.
you guys are awesome
thanks for all your input close this thread.
will be delighted to help any/everyone in the automotive forum
(30 years exp.)
thanks boys
r.burgy
 
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